Patent US4751484A successfully refreshed from Google Patents.
US4751484A
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US
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Drum unit exchange time indicating device for image forming apparatus
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1987-03-03
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Granted: 1988-06-14
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Expires: 2007-03-03
Abstract
Abstract A drum unit exchange time indicating device for image forming apparatus comprises, an integrated signal output means to give output of integrated signal added up according to the time of use of the drum unit, a life signal output means to give output of drum unit life signal when said integrated signal exceeds predetermined value and a paper-feed mode changing means to change the mode of paper-feeding into an extraordinary mode when said drum unit life signal is detected.
Inventors
- 👤 Hideki Matsumoto
- 👤 Shigeo Koyama
- 👤 Hiroshi Kusumoto
- 👤 Yoshizo Kawamori
- 👤 Satoshi Uemori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:00
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/55; G03G15/553; G03G15/50; G03G2221/00; G03G2221/16; G03G2221/1663; G03G2221/1672; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A drum unit exchange time indicating device for image forming apparatus comprising: an integrated signal output means to give output of integrated signal added up according to the time of use of the drum unit; a life signal output means to give output of drum unit life signal when said integrated signal exceeds a predetermined value; and a paper-feed mode changing means to change the mode of paper-feeding into an extraordinary mode when said drum unit life signal is detected, the paper feed mode changing means being so composed that printing speed is made slower than the printing speed under ordinary paper-feed mode when the drum unit life signal is detected.
Claim 2
Dependent Claim
111 words
A drum unit exchange time indicating device for image forming apparatus comprising: an integrated signal output means to give output of integrated signal added up according to the time of use of the drum unit; a life signal output means to give output of drum unit life signal when said integrated signal exceeds a predetermined value; and a paper-feed mode changing means to change the mode of paper-feeding into an extraordinary mode when said drum unit life signal is detected, the paper feed mode changing means being so composed that printing speed is made slower than the printing speed under ordinary paper-feed mode when the drum unit life signal is detected.
Claim 3
Dependent Claim
58 words
A device according to claim 1, wherein the integrated signal output means and the life signal output means are comprised of a waste toner quantity sensing means disposed at a predetermined position of the waste toner tank, and said drum unit life signal is generated when waste toner in the waste toner tank goes over a specified level.
Claim 4
Dependent Claim
45 words
A device according to claim 1, wherein the integrated signal output means is a print number counter means, the life signal output means is a comparator means, and said drum unit life signal is generated when number of times of printing exceeds a specified number.
Claim 5
Dependent Claim
58 words
A device according to claim 1, wherein the integrated signal output means is an integrator means to measure the time of paper going through and to total the measured results, the life signal output means is a comparator means, and said drum unit life signal is generated when total value of paper passing time exceeds a specified time.
Claim 6
Dependent Claim
61 words
A device according to claim 1, wherein the integrated signal output means is an integrator means to measure the time of high-voltage applied to the main charging device and to total the measured results, the life signal output means is a comparator means, and said drum unit life signal is generated when total of high-voltage applied time exceeds a specified value.
Claim 7
Dependent Claim
60 words
A device according to claim 1, wherein the integrated signal output means is an integrator means to measure operating time of the blade of the cleaning device and to total the measured results, the life signal output means is a comparator means, and said drum unit life signal is generated when total of blade operating time exceeds a specified time.
Claim 8
Dependent Claim
113 words
A drum unit exchange time indicating device for image forming apparatus comprising: an integrated signal output means to output an integrated signal added up according to the time of use of the drum; a life signal output means to output a drum unit life signal when said integrated signal exceeds a predetermined value; and a paper-feed mode changing means to change the mode of paper-feeding into an extraordinary mode when said drum unit life signal is detected, said paper-feed mode changing means being so composed that the paper-feed timing in the case of continuous printing is more delayed than the timing of ordinary paper-feed mode when the drum unit life signal is detected.
Claim 9
Dependent Claim
113 words
A drum unit exchange time indicating device for image forming apparatus comprising: an integrated signal output means to output an integrated signal added up according to the time of use of the drum; a life signal output means to output a drum unit life signal when said integrated signal exceeds a predetermined value; and a paper-feed mode changing means to change the mode of paper-feeding into an extraordinary mode when said drum unit life signal is detected, said paper-feed mode changing means being so composed that the paper-feed timing in the case of continuous printing is more delayed than the timing of ordinary paper-feed mode when the drum unit life signal is detected.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |